Robert Mark Fulton was 42 years old when he disappeared on June 28, 1998, after traveling to a cabin on a private lake in rural Caddo County, Oklahoma. He left behind every one of his personal belongings inside that cabin, including his billfold.
The disappearance is the subject of a new Cold Case Spotlight from the Oklahoma State Bureau of Investigation
, which sat down with Fulton's sister to revisit the case and ask the public for information. The agency is directing tips to its tip line at 1-800-522-8017 or [email protected]. Though Fulton vanished in Caddo County, the case has drawn attention online, including in a
Websleuths
discussion thread. It remains unclear what drew Fulton to the property in the first place.
A Description Frozen in 1998
Missing person profile details describe Fulton as a 6-foot-4 Caucasian male weighing between 200 and 240 pounds, with blue eyes and sandy or blonde hair, per the same Websleuths thread. The profile also notes that all four of his wisdom teeth were intact at the time he vanished, a detail investigators could use to compare against unidentified remains. Whether any physical evidence collected from the scene in 1998 remains available for modern forensic or DNA testing is not addressed in available case materials.
Oklahoma's Cold Case Backlog
Fulton's case lands amid a broader reckoning over how Oklahoma handles its long-unsolved disappearances. As of April 2026, the OSBI Cold Case Unit, established in November 2018, was actively investigating roughly 446 cold case homicides and 56 missing or unidentified person cases statewide, according to the Oklahoma House of Representatives. The unit has resolved 98 cases since it was created and was formally commended by the Legislature this spring.
That workload exists against a stark backdrop: statewide data showed Oklahoma had 954 documented missing persons, giving it the highest missing persons rate per capita in the country, as reported by Oklahoma News Report. Lawmakers have responded with a series of legal mandates aimed at closing gaps that let cases like Fulton's languish for decades.
Laws Built to Catch Cases Like This
Under Francine's Law, enacted by the Oklahoma Legislature in 2019, a missing person must be entered into the National Missing and Unidentified Persons System within 30 days, according to the Oklahoma State Bureau of Investigation. The law is named after Tulsa murder victim Francine Frost, whose remains went unidentified for more than 30 years. The OSBI missing-persons clearinghouse provides information about filing reports and entering details into the FBI's National Crime Information Center database.
More recently, the article turns to another alert system. The OSBI post featuring Fulton's case includes a video interview with his sister and asks the public for fresh tips.
Similar Cases Across the State
Fulton's case joins a string of recent OSBI cold case appeals highlighted in Hoodline's coverage, including a Delaware County cold case spotlight on Brett Scheele and a Union City roadside killing that carried a reward. A more recent case out of Tecumseh, involving a 47-year-old man whose truck turned up abandoned, underscores how frequently Oklahoma law enforcement is now asking the public for help solving these disappearances.
For now, the key questions in Fulton's case remain open: what brought him to the Caddo County property, why War Acres police joined the investigation, and whether any answers are still recoverable nearly three decades later. Anyone with information is asked to contact the OSBI tip line at 1-800-522-8017 or [email protected].
